Senior/ Lead FullStack Engineer

Canadian time zone
Time: 6 months

About the Opportunity
Our client is a leading European online car marketplace, serving 30M+ monthly users across 18 countries.

As a Senior/Lead FullStack Engineer:
You will play a key technical leadership role within the client's engineering organization. You will design, build, and evolve scalable backend services and user-facing features across our product suite.
You will contribute across a polyglot stack that includes PHP (Laravel), JavaScript, and TypeScript, collaborating closely with product managers, designers, and other engineers to deliver robust, maintainable, and secure solutions.
This role requires a high level of proficiency in using AI tools in day-to-day software development. AI-assisted workflows are not optionalthey are an expected part of how we design, implement, test, debug, document, and optimize software. As a Senior/ Lead engineer, you will also help elevate your team's AI capabilities by modeling effective usage patterns and sharing best practices.
What You'll Do
Architect, design, and implement scalable services and product features using PHP (Laravel)
Build and maintain frontend features using JavaScript and TypeScript
Use AI tools extensively for code generation, refactoring, test creation, debugging, performance optimization, and documentation
Critically evaluate AI-generated outputs to ensure correctness, security, maintainability, and alignment with architectural standards
Lead technical design discussions and contribute to system and API architecture decisions
Own complex features end-to-end, from technical design through deployment, monitoring, and iteration
Drive improvements in code quality, performance, reliability, and security
Write clean, maintainable, and well-tested code with strong automated test coverage
Conduct in-depth code reviews and mentor engineers through actionable feedback
Coach teammates on effective and responsible AI usage in software engineering workflows
Collaborate cross-functionally to translate business requirements into scalable technical solutions
Contribute to cloud infrastructure and services (AWS), ensuring high availability and operational excellence
Participate in compensated on-call rotations to ensure platform reliability
Champion DevOps best practices, CI/CD improvements, and observability standards
Identify and lead technical initiatives that improve long-term platform sustainability
What We're Looking For
6-8 years of extensive professional experience in backend software development
Strong expertise in PHP and Laravel (6+ years)
Proficiency in JavaScript and TypeScript for modern frontend development
Demonstrated advanced proficiency using AI tools in day-to-day engineering work (code generation, debugging, test automation, documentation, architectural exploration)
Strong ability to validate, refine, and productionize AI-assisted outputs
Experience improving team-level engineering practices
Deep understanding of API design, distributed systems, and scalable architecture patterns
Experience working with AWS or similar cloud environments
Strong knowledge of CI/CD pipelines and modern DevOps practices
Experience designing and optimizing relational databases and data models
Proven ability to independently lead complex technical initiatives
Strong problem-solving skills and ability to navigate ambiguity
Clear and effective communication skills
Participate in compensated on-call rotations to ensure reliability of our backend services
Canadian timezone working hours
English proficiency at B2/C1 level or higher.
Nice to Have
Experience integrating AI capabilities into production products (e.g., LLM integrations, AI-driven features, intelligent workflows)
Experience designing AI-enabled user experiences or backend AI services
Experience in automotive, dealer software, or SaaS platforms
Experience with containerization (Docker, Kubernetes)
Event-driven architectures and messaging systems
Performance tuning and high-scale system optimization
Experience working in multi-product platform environments
We offer*:
Flexible working format – remote, office-based or flexible
A competitive salary and good compensation package
Personalized career growth
Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
Active tech communities with regular knowledge sharing
Education reimbursement
Memorable anniversary presents
Corporate events and team buildings
Other location-specific benefits
*not applicable for freelancers